♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
✅ Cookie consent banner included
✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-gcode.js

@@ -1,16 +0,0 @@
-Prism.languages.gcode = {
-	'comment': /;.*|\B\(.*?\)\B/,
-	'string': {
-		pattern: /"(?:""|[^"])*"/,
-		greedy: true
-	},
-	'keyword': /\b[GM]\d+(?:\.\d+)?\b/,
-	'property': /\b[A-Z]/,
-	'checksum': {
-		pattern: /(\*)\d+/,
-		lookbehind: true,
-		alias: 'number'
-	},
-	// T0:0:0
-	'punctuation': /[:*]/
-};